How do you chang the water pump - 1995 Cadillac DeVille

GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998


Water Pump

CAUTION Never open, service, or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. In addition, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
REMOVAL & INSTALLATION

3.0L Engine
Two electric engine coolant pumps are used in conjunction with the belt driven mechanical pump. The electric pump mounted on the passenger side strut tower, assists the flow of warm coolant to the heater core at idle when ambient temperature is low. This pump runs at all times with the engine on. A failure with this pump would result in poor heating performance especially at idle. The second electric pump is mounted on the driver's side of the radiator, which provides additional flow of coolant through the radiator. This pump is energized when coolant temperatures reach 194° F (90° C).
The mechanical engine water pump, driven by the serpentine drive belt, provides a constant flow of coolant through the engine at all times while the engine is running.




Fig. 3.0L Engine cooling system components


Mechanical engine pump



Fig. Water pump mounting-3.0L

1. Disconnect the negative battery cable.
2. Drain and recycle the engine coolant.
3. Remove the resonance chamber.
4. Remove the front timing belt cover.
5. Remove the water pump bolts and the pump.

1. Clean the water pump and engine block sealing surfaces.
   1. Coat the seal ring of the water pump with silicone grease, GM P/N 12345579
   
   
2. Install the water pump and tighten the bolts to 18 ft. lbs. (25 Nm).
3. Install the front timing belt cover.
4. Install the resonance chamber.
5. Refill and bleed the cooling system.
6. Connect the negative battery cable.

1. Disconnect the negative battery cable.
2. Drain and recycle the engine coolant.
3. Detach the electrical connector from the pump.
4. Disconnect the hoses from the pump.
5. Remove the clips from the pump and the pump from the primary fan housing .

1. Installation is the reversal of the removal procedure.
2. Refill and bleed the cooling system.
3. Connect the negative battery cable.

1. Disconnect the negative battery cable.
2. Drain and recycle the engine coolant.
3. Detach the electrical connector from the coolant pump.
4. Disconnect the hoses from the coolant pump.
5. Remove the cruise control module bracket nuts.
6. Reposition the cruise control module bracket aside.
7. Remove the coolant pump from the wheelhouse panel.

1. Install the coolant pump to the wheelhouse panel.
2. Position the cruise control module bracket in the proper mounting area.
3. Tighten the nuts until fully seated and not stripped.
4. Attach the hoses to the coolant pump.
5. Connect the electrical connector to the coolant pump.
6. Refill and bleed the cooling system.
7. Connect the negative battery cable.

First of all,you will need the Northstar waterpump removal tool, You can get this from most reputable auto part stores.


You need to remove the air filter housing and ducting to gain easy access to the pump.

Remove the shield covering the pulley and belt. The belt is easily removed by levering the tensioner pulley.

The water pump is located at the lower radiator hose manifold where you will also find the thermostat.Remove the manifold cover and you will see the water pump.

Insert the removal tool over the pump making sure it is locked in position.You will need to use a breaker bar on the removal tool and turn the tool CLOCKWISE to release the pump (1/4 turn), or if you imagine the breaker bar being vertical, push towards the windscreen of your car,it takes quite a bit of force to unseat the pump hence the use of a breaker bar.

Installing the new pump does not require as much torque as removing the old one.
Tighten the new pump to 73 ft.lbs. making sure it is seated properly before tightening.

Don't forget to clean out the water pump housing prior to installing the new pump and don't forget to include a new water pump gasket and housing cover gasket.

It is also a good idea to install a new thermostat while you're at it.